基于非均匀性的沥青路面质量控制研究

发布时间：2018-06-08 19:15

本文选题：沥青路面 + 非均匀性　；参考：《长安大学》2014年硕士论文

【摘要】：一直以来，沥青路面早期病害现象比较多，且难以得到有效解决。在高速公路通车三年内，沥青路面不同程度发生坑槽、泛油、车辙等病害。现场调查结果表明，这些病害类型都是局部性的，由此可知这是由于沥青路面的非均匀性所引起的。沥青路面的非均匀性是指沥青混合料在原材料选择、材料组成设计、混合料生产与施工等环节中，局部出现了实际指标与设计或规范要求的指标存在超标准的偏差现象，导致沥青混合料是施工后局部路段所具有的路面性能与设计的期望出现不可接受的差别，从而影响了沥青路面的服务能力和使用寿命。引起非均匀性现象有来自材料的离散、级配控制的差异、设备本身存在的稳定及施工组织中质量控制的差异等。通过分析沥青路面早期病害类型及成因，指出其质量非均匀性的主要影响因素是级配离析、温度离析及弱压实等。探讨各种非均匀性检测技术，包括传统和新兴技术。推荐采用无核密度仪（PQI）结合激光纹理仪在表面和深度方向上定量检测沥青路面的非均匀性，可以同时检测路面横向的、纵向的、竖向的和局部的非均匀性。为定量分析离析程度对路面性能的相关性，通过对不同离析程度的混合料分析其力学指标和性能指标（高温稳定性、低温温度性、水稳定性）。采用汉堡车辙仪分别分析了离析程度与混合料高温稳定性和水敏感性得出，粗集料离析混合的高温稳定性强于细集料离析混合料的；而同样是粗集料离析的混合料，其高温抗车辙能力随着离析程度的增加而降低。同时如只是靠单个指标难以完全评价高温温度性，应综合各项指标共同分析来评价；细集料离析的混合料水稳性好于各种粗集料离析混合料的。对混合料施工现场中的温度离析、弱压实以及级配离析进行了全过程定量分析，并采用灰关联度分析法分析不同因素影响权重，其结果表明影响沥青路面非均匀按程度依次为路面压实、混合料级配及混合料温度。其中，路面压实尤其要控制压实指数；混合料级配首要应控制沥青用量，其次用平均离析率来分析集料差异具有良好的效果；混合料温度离析主要发生在碾压阶段，特别要控制初压阶段的混合料温度。根据施工阶段集料平均离析率、压实指数、初压和复压温度的测定与分析，提出了路面预测密度或空隙率的预测模型，可对路面施工质量非均匀性开展快速、简单评定。
[Abstract]:All along, the asphalt pavement early disease phenomenon is more, and is difficult to get the effective solution. In the three years of expressway opening, asphalt pavement has various degree of pothole, oil, rutting and other diseases. The results of field investigation show that these disease types are local, which is caused by the non-uniformity of asphalt pavement. The non-uniformity of asphalt pavement refers to the selection of raw materials and the design of material composition of asphalt pavement. In the process of mixture production and construction, there is a phenomenon of exceeding the standard deviation between the actual index and the index required by the design or specification. It leads to unacceptable difference between the pavement performance and the design expectation of the local section of the asphalt mixture after construction, which affects the service ability and service life of the asphalt pavement. The causes of non-uniformity include the dispersion of materials, the difference of gradation control, the stability of equipment itself and the difference of quality control in construction organization, etc. By analyzing the types and causes of early diseases of asphalt pavement, It is pointed out that the main influencing factors of mass inhomogeneity are gradation segregation, temperature segregation and weak compaction. Various non-uniformity detection techniques, including traditional and emerging technologies, are discussed. It is recommended that the nonuniformity of asphalt pavement can be detected quantitatively in the direction of surface and depth by using the seedless densitometer (PQI) combined with the laser texture analyzer, and the horizontal and longitudinal pavement can be detected simultaneously. In order to quantitatively analyze the correlation between segregation degree and pavement performance, the mechanical and performance indexes (high temperature stability, low temperature, water stability) of mixture with different segregation degree are analyzed. Based on the analysis of segregation degree and high temperature stability and water sensitivity of mixture by Hamburg rutting instrument, it is concluded that the high temperature stability of coarse aggregate segregation mixture is stronger than that of fine aggregate segregation mixture, and the mixture is also coarse aggregate segregation mixture. Its high temperature rutting resistance decreases with the increase of segregation degree. At the same time, if it is difficult to evaluate the temperature of high temperature completely by a single index, it should be evaluated by the common analysis of each index. The water stability of fine aggregate segregation mixture is better than that of coarse aggregate segregation mixture. The whole process quantitative analysis of temperature segregation, weak compaction and gradation segregation in the construction site of the mixture is carried out. The influence weight of different factors is analyzed by grey correlation degree analysis. The results show that the non-uniform degree of influence on asphalt pavement is pavement compaction, mixture gradation and mixture temperature. Among them, the compaction index should be controlled especially for pavement compaction, asphalt dosage should be first controlled in mixture gradation, and the average segregation rate should be used to analyze the difference of aggregate. The temperature segregation of mixture mainly occurs in the rolling stage. According to the measurement and analysis of the average segregation rate, compaction index, initial pressure and repressing temperature of aggregate in the construction stage, the prediction model of pavement prediction density or void ratio is put forward. The nonuniformity of pavement construction quality can be evaluated quickly and simply.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.217

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